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首页> 外文期刊>International Journal of Thermal Sciences >Numerical prediction of thermal insulation performance and stress distribution of thermal barrier coatings coated on a turbine vane
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Numerical prediction of thermal insulation performance and stress distribution of thermal barrier coatings coated on a turbine vane

机译：涡轮叶片上涂布热阻挡涂层隔热性能和应力分布的数值预测

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摘要

Understanding the thermal insulation performance and thermal stress of thermal barrier coating (TBC) coupled with internal cooling and film cooling plays a key role in designing and predicting the failure of TBC. In this work, A one-dimensional theoretical model is presented to analyze the trends of performance of TBC with respect to various parameters. Based on the fluid-solid coupling method, a three-dimensional (3D) finite element model of a guide vane coated with TBC is performed to evaluate the thermal insulation effectiveness and thermal stress of TBC. Furthermore, the effect of film hole geometries on the thermal insulation performance and thermal stress distribution of TBC are investigated. It is found the thermal insulation effectiveness decreases with the increase of film cooling effectiveness but increases with external/internal convective heat transfer coefficients. According to the thermal stress results, the dangerous regions of TBCs are predicted. Stress concentration occurs at the upstream position of film hole. Compared with the round and fan holes, the thermal stress of TBC with trench hole is lowest. Comprehensive consideration the thermal insulation performance and stress distribution of TBC with different film hole geometries, the trench hole is a better design for a longtime service of TBC.
机译：理解热阻挡涂层（TBC）的绝热性能和热应力与内部冷却和薄膜冷却相结合，在设计和预测TBC的故障方面起着关键作用。在这项工作中，提出了一维理论模型，分析了TBC关于各种参数的性能趋势。基于流体固耦合方法，进行涂有TBC的导叶片的三维（3D）有限元模型以评估TBC的绝热效果和热应力。此外，研究了薄膜孔几何对TBC热绝缘性能和热应力分布的影响。发现热绝缘效果随着薄膜冷却效果的增加而降低，但随着外部/内部对流传热系数的增加而增加。根据热应力结果，预测TBC的危险区域。应力集中在薄膜孔的上游位置发生。与圆形和风扇孔相比，TBC具有沟槽孔的热应力最低。全面考虑TBC具有不同薄膜孔几何形状的TBC的保极性能和应力分布，沟槽孔是TBC的长期服务更好的设计。

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